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r e riggins
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Watershed planning and analysis in action
R. E. Riggins, Robert E. Riggins, E. Bruce Jones, Ranvir Singh · Amer Society of Civil Engineers
596 sayfa · 1990
Watershed management / Congresses / Watersheds / Geology & the lithosphere / Water Resources Engineering
Environmental protection guidelines for construction contract specification writers
R. E. Riggins · National Technical Information Service
123 sayfa · 1975
Specification writing / Construction contracts / Environmental protection
Environmental information acquisition and maintenance techniques
R. E. Riggins · Construction Engineering Research Laboratory, U.S. Army, Corps of Engineers
36 sayfa · 1980
Information storage and retrieval systems / Ecology